What is the network ID of the address 172.31.200.120,given the subnet mask of 255.255.255.0?
A)172.31.
B)172.
C)172.31.200.
D)172.31.200.255

Question

Quizplus · Accepted Answer

To determine the network ID, we need to perform a bit-wise AND operation between the IP address and subnet mask.

IP address: 172.31.200.120
Subnet mask: 255.255.255.0

Convert both to binary:

IP address: 10101100.00011111.11001000.01111000
Subnet mask: 11111111.11111111.11111111.00000000

Performing the bit-wise AND:

10101100.00011111.11001000.01111000 (IP address)
&
11111111.11111111.11111111.00000000 (Subnet mask)
------------------------------------------
10101100.00011111.11001000.00000000 (Network ID)

Convert the resulting binary back to decimal:

10101100.00011111.11001000.00000000

Network ID: 172.31.200.0

Therefore, the correct answer is C) 172.31.200.

What Is the Network ID of the Address 172